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Date: Wed, 13 Dec 2006 12:44:50 -0800
From: Sridhar Samudrala <sri@...ibm.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, lksctp-developers@...ts.sourceforge.net
Subject: [PATCH 3/4][SCTP]: Add support for SCTP_CONTEXT socket option.
[SCTP]: Add support for SCTP_CONTEXT socket option.
Signed-off-by: Ivan Skytte Jorgensen <isj-sctp@...dk>
Signed-off-by: Sridhar Samudrala <sri@...ibm.com>
---
include/net/sctp/structs.h | 4 ++
include/net/sctp/user.h | 2 +
net/sctp/associola.c | 1 +
net/sctp/socket.c | 84 ++++++++++++++++++++++++++++++++++++++++++++
net/sctp/ulpevent.c | 4 ++
5 files changed, 94 insertions(+), 1 deletions(-)
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index b00d85e..8d7f26d 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -275,6 +275,7 @@ struct sctp_sock {
__u16 default_flags;
__u32 default_context;
__u32 default_timetolive;
+ __u32 default_rcv_context;
/* Heartbeat interval: The endpoint sends out a Heartbeat chunk to
* the destination address every heartbeat interval. This value
@@ -1657,6 +1658,9 @@ struct sctp_association {
__u32 default_context;
__u32 default_timetolive;
+ /* Default receive parameters */
+ __u32 default_rcv_context;
+
/* This tracks outbound ssn for a given stream. */
struct sctp_ssnmap *ssnmap;
diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
index 1b7aae6..9e4a39f 100644
--- a/include/net/sctp/user.h
+++ b/include/net/sctp/user.h
@@ -95,6 +95,8 @@ #define SCTP_STATUS SCTP_STATUS
#define SCTP_GET_PEER_ADDR_INFO SCTP_GET_PEER_ADDR_INFO
SCTP_DELAYED_ACK_TIME,
#define SCTP_DELAYED_ACK_TIME SCTP_DELAYED_ACK_TIME
+ SCTP_CONTEXT, /* Receive Context */
+#define SCTP_CONTEXT SCTP_CONTEXT
/* Internal Socket Options. Some of the sctp library functions are
* implemented using these socket options.
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index ad0057d..5db95ca 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -298,6 +298,7 @@ static struct sctp_association *sctp_ass
asoc->default_flags = sp->default_flags;
asoc->default_context = sp->default_context;
asoc->default_timetolive = sp->default_timetolive;
+ asoc->default_rcv_context = sp->default_rcv_context;
return asoc;
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index fa29eae..bdd8bd4 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2746,6 +2746,46 @@ static int sctp_setsockopt_adaption_laye
return 0;
}
+/*
+ * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
+ *
+ * The context field in the sctp_sndrcvinfo structure is normally only
+ * used when a failed message is retrieved holding the value that was
+ * sent down on the actual send call. This option allows the setting of
+ * a default context on an association basis that will be received on
+ * reading messages from the peer. This is especially helpful in the
+ * one-2-many model for an application to keep some reference to an
+ * internal state machine that is processing messages on the
+ * association. Note that the setting of this value only effects
+ * received messages from the peer and does not effect the value that is
+ * saved with outbound messages.
+ */
+static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
+ int optlen)
+{
+ struct sctp_assoc_value params;
+ struct sctp_sock *sp;
+ struct sctp_association *asoc;
+
+ if (optlen != sizeof(struct sctp_assoc_value))
+ return -EINVAL;
+ if (copy_from_user(¶ms, optval, optlen))
+ return -EFAULT;
+
+ sp = sctp_sk(sk);
+
+ if (params.assoc_id != 0) {
+ asoc = sctp_id2assoc(sk, params.assoc_id);
+ if (!asoc)
+ return -EINVAL;
+ asoc->default_rcv_context = params.assoc_value;
+ } else {
+ sp->default_rcv_context = params.assoc_value;
+ }
+
+ return 0;
+}
+
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
@@ -2857,6 +2897,9 @@ SCTP_STATIC int sctp_setsockopt(struct s
case SCTP_ADAPTION_LAYER:
retval = sctp_setsockopt_adaption_layer(sk, optval, optlen);
break;
+ case SCTP_CONTEXT:
+ retval = sctp_setsockopt_context(sk, optval, optlen);
+ break;
default:
retval = -ENOPROTOOPT;
@@ -3016,6 +3059,8 @@ SCTP_STATIC int sctp_init_sock(struct so
sp->default_context = 0;
sp->default_timetolive = 0;
+ sp->default_rcv_context = 0;
+
/* Initialize default setup parameters. These parameters
* can be modified with the SCTP_INITMSG socket option or
* overridden by the SCTP_INIT CMSG.
@@ -4421,6 +4466,42 @@ static int sctp_getsockopt_mappedv4(stru
}
/*
+ * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
+ * (chapter and verse is quoted at sctp_setsockopt_context())
+ */
+static int sctp_getsockopt_context(struct sock *sk, int len,
+ char __user *optval, int __user *optlen)
+{
+ struct sctp_assoc_value params;
+ struct sctp_sock *sp;
+ struct sctp_association *asoc;
+
+ if (len != sizeof(struct sctp_assoc_value))
+ return -EINVAL;
+
+ if (copy_from_user(¶ms, optval, len))
+ return -EFAULT;
+
+ sp = sctp_sk(sk);
+
+ if (params.assoc_id != 0) {
+ asoc = sctp_id2assoc(sk, params.assoc_id);
+ if (!asoc)
+ return -EINVAL;
+ params.assoc_value = asoc->default_rcv_context;
+ } else {
+ params.assoc_value = sp->default_rcv_context;
+ }
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, ¶ms, len))
+ return -EFAULT;
+
+ return 0;
+}
+
+/*
* 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
*
* This socket option specifies the maximum size to put in any outgoing
@@ -4558,6 +4639,9 @@ SCTP_STATIC int sctp_getsockopt(struct s
retval = sctp_getsockopt_adaption_layer(sk, len, optval,
optlen);
break;
+ case SCTP_CONTEXT:
+ retval = sctp_getsockopt_context(sk, len, optval, optlen);
+ break;
default:
retval = -ENOPROTOOPT;
break;
diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c
index e255a70..93ac63b 100644
--- a/net/sctp/ulpevent.c
+++ b/net/sctp/ulpevent.c
@@ -849,8 +849,10 @@ void sctp_ulpevent_read_sndrcvinfo(const
*/
sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);
+ /* context value that is set via SCTP_CONTEXT socket option. */
+ sinfo.sinfo_context = event->asoc->default_rcv_context;
+
/* These fields are not used while receiving. */
- sinfo.sinfo_context = 0;
sinfo.sinfo_timetolive = 0;
put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
-
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